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Material

347 347H 1.4550 Physical Properties






The physical properties of Types 321 and 347 are quite similar and, for all practical purposes, may be considered to be the same. The values given in the table may be used to apply to both steel.

When properly annealed, the Alloys 321 and 347 stainless steel tubing consist principally of austenite and carbides of titanium or columbium. Small amounts of ferrite may or may not be present in the microstructure. Small amounts of sigma phase may form during long time exposure in the 1000°F to 1500°F (593°C to 816°C) temperature range. The stabilized Alloys 321 and 347 stainless steel pipe are not hardenable by heat treatment.

The overall heat transfer coefficient of metals is determined by factors in addition to thermal conductivity of the metal. In most cases, film coefficients, scaling, and surface conditions are such that not more than 10 to 15% more surface area is required for stainless steel than for other metals having higher thermal conductivity. The ability of stainless steel to maintain clean surfaces often allows better heat transfer than other metals having higher thermal conductivity.

Magnetic Permeability
The stabilized Alloys 321 and 347 are generally non-magnetic in the annealed condition with magnetic permeability values typically less than 1.02 at 200H. Permeability values may vary with composition and will increase with cold work. Permeability of welds containing ferrite will be higher.



Typical Physical Properties
Density
Alloy g/cm3
lb/in3
321 7.92 0.286
347 7.96 0.288

Modulus of Elasticity in Tension
28 x 106 psi
193 GPa
Mean Coefficient of Linear Thermal Expansion
Temperature Range  
°C °F cm/cm °C in/in °F
20-100 68 - 212 16.6 x 10-6 9.2 x 10-6
20 - 600 68 - 1112 18.9 x 10-6 10.5 x 10-6
20 - 1000 68 - 1832 20.5 x 10-6 11.4 x 10-6
Thermal Conductivity
Temperature Range  
°C °F W/m•K Btu•in/hr•ft2•°F
20-100 68 - 212 16.3 112.5
20 - 500 68 - 932 21.4 14.7
Specific Heat
Temperature Range  
°C °F J/kg K Btu/lb•°F
0-100 32 - 212 500 0.12

Electrical Resistivity
Temperature Range  
°C °F microhm•cm
20 68 72
100 213 78
200 392 86
400 752 100
600 1112 111
800 1472 121
900 1652 126
Melting Range
°C °F
1398 - 1446 2550 - 2635

Back to 347/347H

Physical Properties of Stainless Steel

General Properties
Chemical Composition
Resistance to Corrosion
Physical Properties
Mechanical Properties
Elevated Temperature Oxidation Resistance
Heat Treatment
Fabrication


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EN 10216-5
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UNS N08020 Nickel Alloy 20 Tubing
UNS N02200 Nickel Alloy 200 Tube
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N06600 600 2.4816 Nickel Alloy Pipe
N06601 601 2.4851 Nickel Alloy Tubing
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C71500 Copper Nickel Tubes
DIN 2391 Seamless Precision Steel Tubes
EN 10305-1 E215 E235 E355 Seamless Precision Steel Tube Tubing Tubes
DIN 2393 St28 St34.2 St37.2 St44.2 St52.3 Welded Precision Steel Tubes
EN 10305-2 E195 E235 E355 Welded Cold Drawn Precision Steel Tube